Use the mouse. You have to be delicate with the water or it will become buggy. The closer your mouse is, the more force will be applied to the surface.
A more advanced, but more buggy, version of the first one. I added the concept of particle velocity inheritance. I could make it a lot better than this, but the list/arrays seem to be really slow, and iterating through all of the sprites in a repeat block offers pretty bad performance penalties. Also, I don't think there is a way to change the value of another Sprites variables externally. Right now, the particles only way of communication is through their neighbors velocities.
